Anaerobic Digestion (AD) is a natural process that biologically breaks down organic material to generate large amounts of biogas which is a combination of methane and carbon dioxide.
The food waste is received and processed to remove packaging and inorganic material and ground into a soup/slurry.
This soup is then pasteurised to ensure compliance with the Animal By-products (ABP) Regulations before entering the Anaerobic Digestion (AD) process.
Biogas produced during the process is cleaned and used to run combined heat and power (CHP) units.
These units provide heat for the process and generate up to 4.96MW of electricity, the majority of which will be exported back into the nation grid.
The digestate is dewatered in centrifuges and the solid cake can be used as a soil conditioner and a high nutrient fertiliser.
Granville Ecopark receives up to 300 tonnes of food waste a day from various customers and contracted suppliers ranging from food waste to waste greases and oils. One tonne of food waste can produce 500KWh of electricity if conditions are controlled and adjusted to suit the type of feedstock.